Looked at the 100 today planning on replacing the thermostat. Well, to my surprise, I see no place for it. Where does it go? What I thought was a thermostat housing is nothing more than an upper water neck. The engine is correct and the serial number for it falls into the correct year for my tractor. The service info I have says nothing about a thermostat

Hard for me to believe it ran without one. The engine runs cool, I mean real cool. Could it be it has an older water neck for an "A"? I know they used radiator shudders for temp control. Any help would be appreciated. Thanks.

One more question, where does the touch control temp sensor attach? I was looking the TC hyd unit over and cannot find any port where it might screw in. Can't believe I'm missing something that seems this easy Brian

The thermostat basicly drops into the hose end opening of the water outlet. There should be a retaining ring that goes in on top of it. If you have the correct outlet, it will have a hole in the right side for a water temperature sensor.

The Touch-Control temperature senser screws into the end of the strainer. If the tractor was not originally equipped with that gage, the strainer probably does not have the provision for screwing the sensor in.